Make CentralSurfaces an Interface.

CentralSurfaces is now an interface. It is a very large and ugly one.
This allows us to remove the provider in StatusBarPhoneModule, and
will make it easier to control how the Optional for CentralSurfaces
is setup.

It is renamed CentralSurfacesInt temporarily to allow maintenance of
the blame and history of CentralSurfaces in CentralSurfacesImpl.

Bug: 229228871
Test: atest SystemUITests && manual
Change-Id: Iab41b70e0c65d75560010d961dcb52a11fd237f5
Merged-In: Iab41b70e0c65d75560010d961dcb52a11fd237f5